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Flight Reliability

DL 5277 · Delta Air Lines

Portland → New York (PWM–JFK)98% of its flights flew this route. The rest (MSP–PIT, PIT–MSP) are included in these numbers.

79
Usually Fine
WanderNerd Reliability Score
92%
Arrive within 15 minutes
6 min early
Average arrival delay
5.4%
Cancelled
14 min early
Median arrival delay

Based on 355 historical flights. Data through May 2026.

What the data says

Wednesdays have been rough.

DL 5277 arrived on time 100% of the time on Thursdays and just 84% on Wednesdays. That gap is worth planning around.

Better than the PWM–JFK route average.

DL 5277 arrived on time 92% of the time, versus 81% across the PWM–JFK route.

Better than the Delta Air Lines network average.

DL 5277 arrived on time 92% of the time, versus 81% across the Delta Air Lines network.

Keep a backup plan handy.

DL 5277 was cancelled 5.4% of the time. Typical for U.S. flights is around 1–2%.

The breakdown

On-time by weekday
  • Mon91%(46 flights)
  • Tue94%(48 flights)
  • Wed84%(49 flights)
  • Thu100%(46 flights)
  • Fri94%(48 flights)
  • Sat94%(53 flights)
  • Sun89%(46 flights)
On-time by departure window
  • 6–9 AM92%(329 flights)
  • 9 AM–12 PM—(1 flights)
  • 12–3 PM—(3 flights)
  • 3–6 PM—(3 flights)
On-time trend by month
100%
May

Jun 96% → May 100% on time

On-time arrival percentage by month
MonthOn-time percentageFlights
June 202596%26
July 202593%27
August 202594%31
September 202590%29
October 202597%30
November 202590%29
December 202591%23
January 202682%27
February 202696%25
March 202683%29
April 202697%30
May 2026100%30
Departures on time
93%
Diverted
0%
Flights flown
336
Months covered
12

Same route, other flights

Keep nerding

Based on 355 historical flights, because apparently we checked. Historical flight data: U.S. Bureau of Transportation Statistics, June 2025 – May 2026. Data through May 2026. How we calculate this.